histogenetic, [213];

ovogenetic, [213], [230], [243];

spermogenetic, [220], [243].

Nussbaum, on heredity, [172], [195], [206];

on regeneration amongst Infusoria, [185], [200].

Obelia, origin of germ-cells of, [208].

Obersteiner, on inheritance of epilepsy in guinea pigs, [311], [313].

Ophiostomum, karyokinesis in ovum of, [368].

Orgyia, [44].

Orth, on the transmission of acquired characters, [411].